puzzle
US /ˈpʌz.əl/
UK /ˈpʌz.əl/

1.
quebra-cabeça, enigma
a game, toy, or problem designed to test ingenuity or knowledge.
:
•
She spent hours trying to solve the jigsaw puzzle.
Ela passou horas tentando resolver o quebra-cabeça.
•
The crossword puzzle in the newspaper was very challenging.
O quebra-cabeça de palavras cruzadas no jornal era muito desafiador.
2.
mistério, enigma
a person or thing that is difficult to understand or explain.
:
•
His sudden disappearance remains a complete puzzle.
Seu súbito desaparecimento permanece um completo mistério.
•
The human mind is a complex puzzle.
A mente humana é um complexo quebra-cabeça.